Decoupling of N and P aggravated upward along food chains in an urban river ecosystem

	Decoupling of N and P aggravated upward along food chains in an urban river ecosystem
	An, Shenqun ; Yan, Zhengbing ; Song, Ying ; Fu, Qiang ; Ge, Feiyang ; Wu, Zehao ; An, Wei; Han, Wenxuan
	2023
Source Publication	CHEMOSPHERE
ISSN	0045-6535
Volume	313 Pages:137555-1-8
Abstract	Anthropogenic input of nutrient has profoundly influenced water quality and aquatic organisms, however, large and unbalanced nitrogen (N) and phosphorus (P) inputs (decoupling) can lead to a range of ecological health problems such as eutrophication. Whether and how the decoupling varies along the aquatic food chain remains poorly addressed. Here we chose an urban river ecosystem in the cosmopolis region of Beijing, with reclaimed water as the entire replenishment water source over 20 years, to demonstrate the decoupling pattern of N vs P across trophic levels. Results showed that organism C, N and P concentration increased, but N:P ratio decreased upward along the food chains, suggesting that this decoupling of N and P increased as trophic level ascends. Compared with natural freshwater ecosystem, the decoupling of N and P was aggravated in the reclaimed water river. Moreover, the homeostasis of N and P were higher at higher relative to lower trophic levels, and higher in macro-food chain relative to planktonic food chain. This study, for the first time, revealed the increasing decoupling of N vs P upward along the major food chains in an urban aquatic ecosystem, and could improve the understanding of nutrient cycling at the food chain level under human disturbance, and provide useful information for ecological restoration and eutrophication control of urban wetlands replenished with reclaimed water.
Department	中国科学院饮用水科学与技术重点实验室
Keyword	Nitrogen and phosphorus stoichiometry Trophic level Nutrient decoupling Stoichiometric homeostasis Nutrient imbalance
Document Type	期刊论文
Identifier	https://ir.rcees.ac.cn/handle/311016/48562
Collection	中国科学院饮用水科学与技术重点实验室
Affiliation	1.China Agricultural University 2.Chinese Academy of Sciences 3.Institute of Botany, CAS 4.Research Center for Eco-Environmental Sciences (RCEES)
Recommended Citation GB/T 7714	An, Shenqun,Yan, Zhengbing,Song, Ying,et al. Decoupling of N and P aggravated upward along food chains in an urban river ecosystem[J]. CHEMOSPHERE,2023,313:137555-1-8.
APA	An, Shenqun.,Yan, Zhengbing.,Song, Ying.,Fu, Qiang.,Ge, Feiyang.,...&Han, Wenxuan.(2023).Decoupling of N and P aggravated upward along food chains in an urban river ecosystem.CHEMOSPHERE,313,137555-1-8.
MLA	An, Shenqun,et al."Decoupling of N and P aggravated upward along food chains in an urban river ecosystem".CHEMOSPHERE 313(2023):137555-1-8.

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